CEO Joseph C. Magnacca said in a statement that its mobile business was hurt because the current handset assortment didn't resonate well with customers. It was also contending with more promotions, including those of wireless carriers.

Magnacca said that RadioShack is working on building its pipeline of new products, including private brand and exclusive items such as those from new partnerships with Quirky and PCH.

The company is trying to update its image and compete with the rise of online and discount retailers. Long known as a destination for batteries and obscure electronic parts, RadioShack has sought to remake itself as a specialist in wireless devices and accessories. But growth in the wireless business is slowing, as more people have smartphones and see fewer reasons to upgrade.

Part of its turnaround effort has included cutting costs, renovating stores and shuffling management. It also announced in March that it planned to close up to 1,100 of its stores in the U.S., leaving it with more than 4,000 U.S. locations.